Global warming is the long term warming of the planet's overall temperature. Though this warming trend has been going on for a long time, it's pace has significantly increased in the last hundred yearsdue to the burning of the fossil fuels. As the human population has increased, so has the volume of the fossil fuels have burned. Fossil fuel include coal, oil,and natural gas, and burning them causes what is known as "greenhouse effect" in earth's atmosphere. The greenhouse effect is when the sun rays.